diff --git a/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java b/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java
index e8c7aec..53e03cd 100644
--- a/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java
+++ b/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java
@@ -1,10 +1,26 @@
 package school.lemon.changerequest.java.introduction.pr1;
 
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class Bob {
 
     public static String hey(String phrase) {
-        return "";
+
+
+        if (phrase.equals(phrase.toUpperCase()) ) {
+            return "Chill out!";
+        }
+     else   if (phrase.endsWith("?")) {
+            return "Yeap.";
+        }
+        String trimmed = phrase.trim();
+        if (trimmed.isEmpty()) {
+            return "Fine.";
+        }
+
+        return "Whatever.";
     }
 
 }
diff --git a/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java b/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java
index da96e86..068e1ce 100644
--- a/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java
+++ b/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java
@@ -1,9 +1,62 @@
 package school.lemon.changerequest.java.introduction.pr1;
 
 
+import java.util.Scanner;
+
 public class ConsoleCalculator {
+    public int Add(int scannetFirstNumInt, int scannetSecondNumInt, String scannerOperations) {
+        if (scannerOperations.equals("add"))
+        {
+        return  scannetFirstNumInt + scannetSecondNumInt;}
+        return 0;
+    }
 
-    public static void main(String[] args) {
+    public int Sub(int scannerFirstNum, int scannerSecondNum) {
+        return scannerFirstNum - scannerSecondNum;
+    }
 
+    public int Mul(int scannerFirstNum, int scannerSecondNum) {
+        return scannerFirstNum * scannerSecondNum;
     }
+
+    public int Div(int scannerFirstNum, int scannerSecondNum) {
+        return scannerFirstNum / scannerSecondNum;
+    }
+
+
+    public static void main(String[] args) {
+        System.out.println("Console calculator:");
+        System.out.println("Enter 'add' to perform addition.");
+        System.out.println("Enter 'sub' to perform subtraction.");
+        System.out.println("Enter 'mul' to perform multiplication.");
+        System.out.println("Enter 'div' to perform division.");
+        System.out.println("Enter 'exit' to exit.");
+        System.out.println("Enter 'help' to see help message.");
+        System.out.println("Make your choice.");
+        Scanner scannerOperations = new Scanner(System.in);
+
+
+        System.out.println("Enter first number:");
+        Scanner scannerFirstNum = new Scanner(System.in);
+        int scannetFirstNumInt;
+        if (scannerFirstNum.hasNextInt()) {
+            scannetFirstNumInt = scannerFirstNum.nextInt();}
+
+            System.out.println("Enter second number:");
+            Scanner scannerSecondNum = new Scanner(System.in);
+            int scannetSecondNumInt;
+            if (scannerSecondNum.hasNextInt()) {
+                scannetSecondNumInt = scannerSecondNum.nextInt();}
+
+
+                ConsoleCalculator resultat = new ConsoleCalculator();
+
+                System.out.println("Result of" + resultat);
+                System.out.println("Make your choice.");
+                Scanner scannerOperationsSecond = new Scanner(System.in);
+                System.out.println("Make your choice.");
+
+            }
+
+
 }
diff --git a/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java b/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java
index b8a218f..6cf4519 100644
--- a/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java
+++ b/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java
@@ -2,6 +2,14 @@
 
 public class HammingDistance {
     public static int compute(String a, String a1) {
+        if (a.length() == a1.length()) {
+            int numbers = 0;
+            for (int i = 0; i < a.length(); i++) {
+                if (a.charAt(i) != a1.charAt(i))
+                    numbers++;
+            }
+            return numbers;
+        }
         return -1;
     }
 }